public function fetchSubscriberByEmail($email, $asObject = true)
 {
     return eZPersistentObject::fetchObject(jajNewsletterSubscription::definition(), null, array('email' => $email, 'subscription_list_id' => $this->ID), $asObject);
 }
 static function fetchByUUID($uuid, $asObject = true)
 {
     return eZPersistentObject::fetchObject(jajNewsletterSubscription::definition(), null, array('uuid' => $uuid), $asObject);
 }